Sawing machine



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M IFLII March 31, 1953 E; R. EVANS ET AL SAWING MACHINE Filed Aug 121950 5 Sheets-Sheet 2 I nuant. [TD'E EDWIN HEZVANE W EVANS HL'LEI 1*rue.

M mf mi m March 31, 1953 Flled Aug 12, 1950 MW 2% 3 Hm W /r w n U 2 aRW/ QM A 5 m1 w /M DH m E. 'R. EVANS ET AL SAWING MACHINE March 31, 1953Filed Aug 12, 1950 Patented Mar. 31, 1953 SAWIN G MACHINE Edwin RobertEvans and John Henry Walter Evans, Hamilton, Ontario, Canada ApplicationAugust 12, 1950, Serial No. 179,032

3 Claims.

. l Our invention relates to a machine for cleaning reclaimed-concreteform boards or panels, and

the object of the invention is to provide a machine wherein usedconcrete form boards or panels may be reconditioned for further use inthe construction of concrete formsQ General practice in the constructionindustry has been to scrap concrete form boards after they have beenremoved from the set concrete, and to use new lumber in the constructionof forms. This practice was not considered to bepa-rticularIy wastefulwhen lumber was abundant and cheap, but due to todays scarcity of lumberand high prices, it is realized that the scrapping of used 'form board-sadds considerably to concrete con struction costs and alsoveryfrequently delays construction due to the difficulty in obtainingnew lumber. v

A particular object of the present invention is todevi-se a simple andeffective machine through which used concrete form' boards may be passedfor reclaiming, and wherein protruding nails in the boards may bereadily severed and the boards thoroughly cleaned of adhering concretewhereby they are put into condition for re-use. Another object of theinvention is to provide board flattening or squeezing rollers in themachine so that the nails may be out off close to the board surface andthe faces of the boards thoroughly scrubbed and cleaned. irrespective ofany warps developed inthe boards due to exposure of their inner faces towet concrete.

circular saw being supported in the frame and.

positioned to engage nail ends hanging from the board and cut them off.

With the foregoing and other objects in view as shall hereinafterappear, our invention consists of a concrete form board or panelcleaning machine, all as hereinafter more particularly described andillustrated in the accompanying drawings inwhich:

Fig. l is a plan view of the machine.

Fig. 2 is a vertical longitudinal cross-sectional view through themachine, being taken through the line 2- 2, Fig. l.

Fig. 3 is an enlarged transverse cross-sectional view through themachine, being taken through the line 3-3, Fig. 1. I

Fig. 4 is an enlarged transverse cross-sectional view through themachine, being taken through the line 4-4, Fig. l, and

nected by an endless chain l0.

Fig. 5 is an enlarged side elevatlonal view of a fragmentary portion ofthe machine, being taken from the line 5-45, Fig. 1.

Like characters of reference indicate corresponding parts in thedifferent views of the drawmgs.

The machine broadly comprises a plurality of pairs of upper and lowerrollers, a nail cutting saw and a pair of scrubbing rollers, all ofwhich are supported in horizontal alignment uponna frame 2 of such aheight that the boards may be conveniently passed through the machine bythe operator.

The board feed end of the frame .2 carries a pair of spacedeapartparallel channel guide members 3 between which a board may be fed intothe machine, as illustrated in Fig. 4. In order to permit the distancebetween the channels 3 to be adjusted to various board width-s, a pairof threaded spindles =4 are mounted within bearings '5 in the vicinityof the upper edges of the frame 2. Each of the spindles 4 is formed withtwo threaded portions 6 and 1 at either end thereof, the threads 6 beingright-hand threads and the threads I being left-hand threads. The guidechannels 3 are carried upon two pairs of screw blocks '8 which aremounted upon the threaded portions 6 and l of the spindles 5, wherebyrotation of the spindles 3 in one direction will move the blocks 8 andchannels 3 towards each other and rotation of the spindles l in theopposite direction will move the blocks 8 and channels 3 apart. 7

In order that the screw blocks '8 may move in unison upon rotation ofthe spindles 4, two sprocket wheels 9 of equal diameter are-mounted uponthe ends of the spindles =4 and are con- One of the spindles A carriesan operating handle H upon its end opposite to the end carrying thesprocket wheel 9. It will be understood that upon rotation of the handle'I l the operator may either move the guide channels-3 towards eachother or apart to suit the width of the boards being passed between thechannels.

To carry a board into the machine, a pair of feed rollers l2 and [3 aresuitably mounted and positioned upon the frame 2 at the inner end of thechannel guide assembly. The roller l3, as illustrated in Fig. 3,consists of a shaft 1M oarrying a plurality ofequal diameter rollerflanges it which are adjustably secured in any suitable manner upon theshaft M as by locking screws L6. The outer flanges P5 are formed withlips I! which act as guides in directing a board I-B between therollers. The roller shaft M carries 1a sprocket wheel [9 on one endthereof and over which a drive chain 2% passes.

As used form boards generally carry a number of nails which remain inthe board after it is pulled out of placed in taking down a concreteform, the purpose of providing a board guide consisting of two channelsand lower rollers of flange form will be readily apparent upon referenceto Figs. 3 and i. The channels 3 are so proportioned that they onlyoverlie the edges of the board 8 to a slight degree so as to clear thenails 2! which are usually spaced in from the edges of a board, and theflanges i5 are so arranged upon the shaft L l-that the nails will passbetween the flanges as the board passes through the feed rollers.

A second pair of rollers 22 and 23 are adjacently positioned to the feedrollers i2v and i3 and are of the same construction and arrangement,except that the roller 23 is not driven. The rollers 22 and 23 areprovided for the purpose of flattening a warped board, such asillustrated in Figs. and i, and for this purpose are spaced apart adistance substantially equal to the thickness of a board.

A circular saw 24 is positioned adjacently to the, pair of rollers 22and 23 and is arranged to lie in close proximity to the bottom face of aboard passing thereover. The saw is carried upon the upper end of ashaft 25 mounted within a pair of bearing blocks 26 and driven by amotor 27 through the medium of a drive belt 23 extending around a pairof sprockets 2e and at on the motor shaft and saw shaft 25. The circularsaw is designed to rotate at a high speed and out off any nails 21protruding downwardly from a board passing thereover.

Another pair of board squeezing or flattening rollers 3i and 32 arecarried upon the frame to receive the board after it passes over thenail cutting saw 24 for the purpose of retaining a warped board in itsflattened form as it passes over the saw to be directed between thescrubbing brushes.

The board cleaning assembly is adiacently positioned to the rollers 3!and 32 and consists of a pair of rotary scrubbing brushes 33 and 3 whichare carried upon spindles 35 and 36. The spindle 35 is mounted within apair of bearing blocks 37! carried within bearing block frames 33extending upwardly from the frame 2. The spindle 36 of the brush 3a iscarried within a pair of bearing blocks 39 secured to the under sides ofthe top members of the frame 2. 'The spindles 35 and 3B carry gearwheels t!) and-4i which mesh with a suitably mounted gear wheel '52positioned therebetween. The spindle 35 also carries a sprocket wheel 43over which a drive chain 4-": passes. It will be apparent that rotationof the scrubbing brush 34 and its spindle 36 will, through the medium ofthe-gears t0, 4! and 42, rotate the scrubbing brush 33.

To feed a finished board from out of the machine, a pair of rollers 45and ii: are mounted upon the frame 2 adjacent to the scrubbing brushes,the spindle fi'i of the lower roller carryed for vertical adjustment.The spindles of the upper rollers are carried within bearing blocks 52which are slidably mounted within inverted U-shaped frames 53 carriedupon the upper edges of the frame 2. The blocks 52 are urged upwardlywithin the frames by compression springs 54 inserted between the lowerfaces of the blocks 52 and the top edges of the frame 2. Adjustingscrews 55 are threaded into the top cross members of the frames 53 tobear against the upper faces of the bearing blocks 52.

In moving the rollers closer together the adjusting screws 55 arethreaded downwardly whereby the bearing blocks 52 are moved clownwardlyagainst the compression of the springs 54. To move the blocks apart theadjusting screws 55 are. threaded upwardly to allow the compressedsprings 54 to push the bearing blocks upwardly.

The machine driving rollers and saw may be driven in any suitablemanner, as, for example, that shown in the, drawings, wherein we furnishtwo motors, one motor for drivin the rollers and a second motor 2?, ashereinbefore described, for driving the saw. v

The roller drive comprises a motor 56 coupled to a speed reduction anddrive reversing gear box 5?. The gear box is designed to incorporate apair of drive shafts which rotate in opposite directions. Referring toFig. 5, one drive shaft 58 is contained within a second hollow driveshaft or sleeve 59, which rotates in the opposite direction to the shaft58. The drive chain id extending from the sprocket it of the scrubbingbrushes extends over a sprocket wheel 69 secured to the drive shaft 59,.

The drive shaft 58 protrudes outwardly from the hollow end of the driveshaft 59 and upon which a pair of sprocket wheels are mounted. Qnesprocket wheel carries the chain 2b which extends to the sprocket i9 ofthe lower feed roller i3, and the other sprocket wheel carries the chaint9 extending to the sprocket wheel 48 of the roller 46. It will thus beappreciated that through this arrangement the scrubbing brushes 33 and3d rotate in the opposite direction to the driving rollers whereby thebrushes rotate against the movement of the board passing therebetween.

In adjusting the machine, the guide channels 3 are arranged such adistance apart that a board may freely slide therehetween. The roller [2of the feed rollers 52 and i3 is adjusted inheight so that a board maybe readily fed between the rollers by the operator. The board flatteningrollers 22 and 3! of the pairs of rollers .22 and 23 and 31 and 3,2 areso adjusted in height that the distance between the faces of the rollersof each pair is substantially equal to the thickness of the board to bereceived, so that a warped board, such as illustrated in Figs. 3 and i,in passing between these pairs of rollers is flattened whereby thecircular saw may be ad- .iusted to sweep across the lower face of theboard passing thereover, and the scrubbing brushes to engage the boardpassing therethrough across its entire width.

It will thus be apparent that we have devised a, very simple type ofmachine which may be readily set up at the site of a buildingconstrucciated that it may be readily proportioned to treat and reclaimform panels in the same manner as the boards, and while we have shownand described a particular embodiment of our invention, it is to beunderstood that we may make such changes and alterations as we may fromtime to time deem necessary, without departing from the spirit of ourinvention as set forth in the appended claims.

What We claim as our invention is:

1. A machine for reclaimed nail containing concrete form boards andcomprising a frame supporting a plurality of pairs of upper and lowerrollers between which a board may be passed for reclaiming and a sourceof power for rotating several of the rollers, one pair of rollersconstituting the means for feeding a board therebetween into th machineand having one of its rollers driven from the source of power, one ofthe said board feeding rollers being formed with a plurality of boardface engaging flanges, a sec ond pair of rollers constituting the meansfor flattening a board and adjacently positioned to the board deliveryside of the feed rollers and having their rolling faces spaced apart adistance substantially equal to the thickness of the board to bereceived therebetween whereby the faces of said rollers engage theentire widths of the upper and lower faces of the board, and a circularnail severing saw driven from the source of power and positionedadjacently to the board flattening rollers at the board delivery sidethereof, the circular saw being positioned to lie in close proximity tothe bottom face of a board passing thereover.

'2. A machine for reclaimed nail containing concrete form boards andcomprising a frame supporting a plurality of pairs of upper and lowerrollers between which a board may be passed for reclaiming and a sourceof power for rotating several of the rollers, one pair of rollersconstituting the means for feeding a board therebetween into the machineand having one of its rollers driven from the source of power, one ofthe said board feeding rollers being formed with a plurality of boardface engaging flanges, a second pair of rollers constituting the meansfor flattening a board and adjacently positioned to the board deliveryside of the feed rollers and having their rolling faces spaced apart adistance substantially equal-to the thickness of the board to bereceived therebetween whereby the faces of said rollers engage theentire widths of the upper and lower faces of the board, a circular nailsevering saw driven from the source of power and positioned adjacent tothe board flattening rollers at the board delivery side thereof, the.circular saw being positioned to lie in close proximity to the bottomface of a board passing thereover, a second pair of board flatteningrollers positioned to receive a. board in its travel upon passing out ofcontact with the nail severing saw.

3. A machine for reclaimed nail containing concrete form boards andcomprising a frame supporting a plurality of pairs of upper and lowerrollers between which a board may be passed for reclaiming and a sourceof power for rotating several of the rollers, one pair of rollersconstituting the means for feeding a board therebetween into the machineand having one of its rollers driven from the source of power, one ofthe said board feeding rollers being formed with a plurality of boardface engaging flanges, a second pair of rollers constituting the meansfor flattening a board and adjacently positioned to the board deliveryside of the feed rollers and having their rolling faces spaced apart adistance substantially equal to the thickness of the board to bereceived therebetween whereby the faces of said rollers engage theentire widths of the upper and lower faces of the board, a circular nailsevering saw driven from the source of power and positioned adjacentlyto the board flattening rollers at the board delivery side thereof, thecircular saw being positioned to lie in close proximity to the bottomface of a board passing thereover, a third pair of board flatteningrollers positioned to receive a board in its travel upon passing out ofcontact with the saw, and a fourth pair of rollers positioned to receivea board passing out of contact with the third pair of board flatteningrollers and deliver it from the machine.

EDWIN ROBERT EVANS.

JOHN HENRY WALTER EVANS.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 726,403 Calhoun Apr. 28, 1903944,489 Linderman Dec. 23, 1909 1,086,337 Snodgrass Feb. 3, 19141,440,762 Berkley Jan. 2, 1923 1,630,832 Jacobowitz Aug. 20, 19271,836,499 Poinsett Dec. 15, 1931 2,072,122 Montgomery Mar. 2, 19372,260,767 Black Oct. 28, 1941 2,288,988 Blout July 7, 1942 2,313,606Webb Mar. 9, 1943 2,522,769 Anderson Sept. 19, 1950 FOREIGN PATENTSNumber Country Date 338,076 Germany Dec. 11, 1919

